WO2007045342A1 - Method for producing a penetrator - Google Patents

Method for producing a penetrator Download PDF

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Publication number
WO2007045342A1
WO2007045342A1 PCT/EP2006/009509 EP2006009509W WO2007045342A1 WO 2007045342 A1 WO2007045342 A1 WO 2007045342A1 EP 2006009509 W EP2006009509 W EP 2006009509W WO 2007045342 A1 WO2007045342 A1 WO 2007045342A1
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WO
WIPO (PCT)
Prior art keywords
tungsten
penetrator
powder mixture
core
powder blend
Prior art date
Application number
PCT/EP2006/009509
Other languages
German (de)
French (fr)
Inventor
Cornelis Taal
Rene Oudelhoven
Michael Vagedes
Uta Lenz
Original Assignee
Rheinmetall Waffe Munition Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rheinmetall Waffe Munition Gmbh filed Critical Rheinmetall Waffe Munition Gmbh
Priority to EP06792334A priority Critical patent/EP1940574B1/en
Priority to PL06792334T priority patent/PL1940574T3/en
Priority to US12/083,671 priority patent/US8580188B2/en
Publication of WO2007045342A1 publication Critical patent/WO2007045342A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/06—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/004—Filling molds with powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/74—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the core or solid body
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the invention relates to a method for producing a penetrator with a tungsten heavy metal (WSM) penetrator core with a high proportion of tungsten and an outer jacket which consists of a material which is more ductile than the penetrator core.
  • WSM tungsten heavy metal
  • Tungsten-heavy metal alloy penetrators typically have a high tungsten content (90 to about 97% by weight), because of their high masses, these materials have good penetration performance on normal impact on simple armored targets.
  • the high proportion of tungsten leads to embrittlement of the material, so that it often comes before the penetration of the target to a breakup of the penetrator with obliquely arranged targets and multi-plate targets.
  • the kinetic energy of the resulting relatively short fragments is usually insufficient due to their low mass to penetrate the remaining target plate (s).
  • the brittleness of well-known WSM penetrators is often increased by the fact that in the mechanical processing, for example by turning or grinding, cracks of the near-surface tungsten grains occur, which then can lead to premature failure of the respective penetrator in the load case by crack propagation.
  • the invention has for its object to provide a comparison with other known methods simpler method for producing a penetrator with brittle penetrator core and ductile jacket.
  • the invention is essentially based on the idea of concentrically introducing in a mold adapted to the outer dimensions of the penetrator a double hopper filling device adapted to the dimensions of the penetrator core. While in the inner tube, a first tungsten-containing powder mixture with high tungsten content (90- 99 wt.%) Is filled for the preparation of the penetrator core, in the annular space located between the outer wall of the inner tube and the inner wall of the mold, a second tungsten-containing powder mixture with respect to first powder mixture lower tungsten content (approximately between 83% and 91%) introduced. After removal of the inner tube from the mold then takes place in a conventional manner required for the preparation of the penetrator pressing the powder mixture, the sintering, the cold forming of the compact and finally the finishing of the pen- netrator blank.
  • a penetrator is produced with a core of high density and a tough outer sheath frictionally connected to the penetrator core, wherein the outer sheath prevents breakage on oblique target collision.
  • the first tungsten-containing powder mixture has proven to be a mixture with 95% by weight of tungsten and a balance of nickel and cobalt powder in a weight ratio of 9: 1.
  • a mixture of 87 wt .-% tungsten and a balance of nickel and cobalt powder, also in a weight ratio of 9: 1 resulted as the second tungsten-containing powder mixture in an advantageous manner.
  • FIG. 1 shows a longitudinal section through a mold for producing a Penetratorrohlings containing therein powder mixtures
  • FIG. 2 shows a longitudinal section of a part of the penetrator produced by the process according to the invention.
  • FIG. 1 designates a plastic mold adapted to the outer dimensions of the compact to be produced, in which a double hopper filling device is concentrically inserted.
  • the inner tube 3 and the double funnel 2 are preferably made of stainless steel and have a wall thickness of about 1 mm.
  • the annular space located between the die 1 and the inner tube 3 has a wall distance of about 1/8 of the inner diameter.
  • Both concentric funnels are connected in the conical area by means of transverse struts.
  • a first tungsten-containing powder mixture 4 is introduced with a tungsten content of 95 wt .-% and a balance of nickel and cobalt powder in a weight ratio of 9: 1.
  • a second tungsten-containing powder mixture 5 having a tungsten content of 87% by weight and likewise a balance of nickel and cobalt powder in a weight ratio of 9: 1 is introduced into the annular space.
  • the double hopper filling device is removed from the pressmatrix 1 and then the entire powder mixture is hydrostatically compressed after pre-compaction caused, for example, by shaking. Subsequently, the pressing is then performed according to the desired specifications of the finished sintered in a conventional manner, heat-treated, cold-formed, hot outsourced and then finished by a machining process, as known for example from US 3,979,234.
  • FIG. 2 shows the longitudinal section of a part of the penetrator 10 produced by the process according to the invention.
  • the penetrator core which is relatively brittle due to the high proportion of tungsten
  • 7 the outer shell which is significantly more ductile due to the lower tungsten content, are designated as threaded.
  • a transition region 8 with a preferred thickness between 25 ⁇ m and 200 ⁇ m, which ensures good adhesion between the core 6 and the jacket 7.
  • the tough shell 7 is preferably removed in the tip-side region, for example by machining, so that it is made of a core material tip and breaks brittle in the target impact, whereby ever sharp Anb formulatekanten arise that ensure a good Anb bracket .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention relates to a method for producing a penetrator (10) from a tungsten heavy metal with a high fraction of tungsten and an outer sheath (7), which consists of a material that is more ductile in relation to the penetrator core (6). To produce a penetrator (10) of this type in a cost-effective manner, according to the invention a twin-hopper filling device, which corresponds to the dimensions of the penetrator core (6), is introduced concentrically into a compression mould (1) that corresponds to the outer dimensions of the penetrator (10). The inner pipe (3) is filled with a first tungsten powder blend with a high fraction of tungsten for producing the penetrator core (6), whilst the annular gap between the outer wall of the inner pipe and the inner wall of the compression mould (1) is filled with a second tungsten powder blend with a lower fraction of tungsten, (approximately between 85 % and 91 %), than the first powder blend. Once the inner pipe (3) has been removed from the compression mould (1), the powder blend is then compressed in the known manner to produce the penetrator (10), the compressed body is subsequently sintered and cold-formed and the penetrator slug is finally finished.

Description

Verfahren zur Herstellung eines Penetrators Process for the preparation of a penetrator
Die Erfindung betrifft ein Verfahren zur Herstellung eines Penetrators mit einem Penetra- torkern aus Wolfram-Schwermetall (WSM) mit hohem Wolframanteil und einem äußeren Mantel, der aus einem gegenüber dem Penetratorkern duktileren Material besteht.The invention relates to a method for producing a penetrator with a tungsten heavy metal (WSM) penetrator core with a high proportion of tungsten and an outer jacket which consists of a material which is more ductile than the penetrator core.
Penetratoren aus einer Wolfram-Schwermetall-Legierung besitzen üblicherweise einen hohen Wolframanteil (90 bis ca. 97 Gew.-%), da diese Werkstoffe aufgrund ihrer hohen Massen gute Penetrationsleistungen bei senkrechtem Aufprall auf einfache gepanzerte Ziele besitzen. Allerdings führt der hohe Wolframanteil zu einer Versprödung des Werkstoffes, so dass es bei schräg angeordneten Zielen sowie bei Mehrplattenzielen häufig bereits vor Durchdringen des Zieles zu einem Auseinanderbrechen des Penetrators kommt. Die kinetische Energie der dabei entstehenden relativ kurzen Bruchstücke reicht aufgrund ihrer geringen Masse in der Regel nicht aus, um die verbleibende(n) Zielplatte(n) zu durchdringen.Tungsten-heavy metal alloy penetrators typically have a high tungsten content (90 to about 97% by weight), because of their high masses, these materials have good penetration performance on normal impact on simple armored targets. However, the high proportion of tungsten leads to embrittlement of the material, so that it often comes before the penetration of the target to a breakup of the penetrator with obliquely arranged targets and multi-plate targets. The kinetic energy of the resulting relatively short fragments is usually insufficient due to their low mass to penetrate the remaining target plate (s).
Die Sprödigkeit bekannter WSM-Penetratoren nimmt häufig noch dadurch zu, dass bei der mechanischen Bearbeitung, beispielsweise durch Drehen oder Schleifen, Anrisse der oberflächennahen Wolframkörner auftreten, die im Belastungsfall dann durch Rißfortpflanzung zu einem frühzeitigen Versagen des jeweiligen Penetrators führen können.The brittleness of well-known WSM penetrators is often increased by the fact that in the mechanical processing, for example by turning or grinding, cracks of the near-surface tungsten grains occur, which then can lead to premature failure of the respective penetrator in the load case by crack propagation.
Aus der DE 41 13 177 C2 ist es bekannt, zur Erhöhung der Festigkeit von mechanisch bearbeiteten Penetratoren die äußeren Wolfram-Schichten des jeweiligen in seiner Geometrie endbearbeiteten Penetrators durch Ätzen zu entfernen. Es hat sich nämlich gezeigt, dass durch ein derartiges Abätzen der äußeren Wolfram-Schichten die Kerbschlagzähigkeit des entsprechenden Penetrators wesentlich (d.h. bis zu 20 %) erhöht wird.From DE 41 13 177 C2 it is known to increase the strength of mechanically processed penetrators to remove the outer tungsten layers of the respective finished in its geometry penetrator by etching. Namely, it has been found that such etch of the outer tungsten layers significantly (that is, up to 20%) enhances the impact strength of the corresponding penetrator.
Nachteilig bei diesem bekannten Verfahren ist allerdings, dass Säuren verwendet werden müssen, die anwendungs- und umweltunfreundlich sind. Außerdem ist die Herstellung derartiger Penetratoren relativ aufwendig, weil durch den Ätzvorgang die vorgegebenen Maße des Penetrators nicht beeinflusst werden dürfen. Aus der DE 40 16 051 C2 ist ferner ein Penetrator bekannt, bei dem ein z.B. aus Wolfram- Schwermetall bestehender bruchempfindlicher Penetratorkern mittels einer duktilen Hülle geschützt wird. Hierzu wird die z.B. aus Stahl bestehende duktile Hülle nach Fertigung des Wolframkerns durch Drückwalzen formschlüssig auf den Penetratorkern aufgebracht. Auch dieses bekannte Verfahren ist relativ zeit- und kostenaufwendig.A disadvantage of this known method, however, that acids must be used, which are application and environmentally unfriendly. In addition, the production of such penetrators is relatively expensive, because the predetermined dimensions of the penetrator may not be affected by the etching process. From DE 40 16 051 C2, a penetrator is also known in which an example of tungsten heavy metal existing fragile penetrator core is protected by a ductile shell. For this purpose, the ductile casing, which consists for example of steel, is applied to the penetrator core in a form-fitting manner after the tungsten core has been produced by pressure-rolling. This known method is relatively time consuming and expensive.
Der Erfindung liegt die Aufgabe zugrunde, ein gegenüber vergleichbaren bekannten Verfahren einfacheres Verfahren zur Herstellung eines Penetrators mit sprödem Penetratorkern und duktilem Mantel anzugeben.The invention has for its object to provide a comparison with other known methods simpler method for producing a penetrator with brittle penetrator core and ductile jacket.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Weitere, besonders vorteilhafte Ausgestaltungen der Erfindung offenbaren die Unteransprüche.This object is achieved by the features of claim 1. Further, particularly advantageous embodiments of the invention disclose the dependent claims.
Die Erfindung beruht im Wesentlichen auf dem Gedanken, in eine an die Außenabmessungen des Penetrators angepasste Pressform konzentrisch eine an die Abmessungen des Penetratorkerns angepasste Doppeltrichtereinfüllvorrichtung einzubringen. Während in dem Innenrohr eine erste wolfram haltige Pulvermischung mit hohem Wolframanteil (90- 99 Gew. %) zur Herstellung des Penetratorkerns eingefüllt wird, wird in den zwischen der Außenwand des Innenrohres und der Innenwand der Pressform befindliche ringförmige Raum eine zweite wolframhaltige Pulvermischung mit gegenüber der ersten Pulvermischung geringerem Wolframanteil (etwa zwischen 83 % und 91 %) eingebracht. Nach Entfernen des Innenrohres aus der Pressform erfolgt dann in an sich bekannter Weise das zur Herstellung des Penetrators erforderliche Pressen der Pulvermischung, das Sintern, das Kaltumformen des Presskörpers und schließlich das Endbearbeiten des Pe- netratorrohlings.The invention is essentially based on the idea of concentrically introducing in a mold adapted to the outer dimensions of the penetrator a double hopper filling device adapted to the dimensions of the penetrator core. While in the inner tube, a first tungsten-containing powder mixture with high tungsten content (90- 99 wt.%) Is filled for the preparation of the penetrator core, in the annular space located between the outer wall of the inner tube and the inner wall of the mold, a second tungsten-containing powder mixture with respect to first powder mixture lower tungsten content (approximately between 83% and 91%) introduced. After removal of the inner tube from the mold then takes place in a conventional manner required for the preparation of the penetrator pressing the powder mixture, the sintering, the cold forming of the compact and finally the finishing of the pen- netrator blank.
Durch das erfindungsgemäße Verfahren wird ein Penetrator mit einem Kern hoher Dichte und zähem kraftschlüssig mit dem Penetratorkern verbundenen äußeren Mantel erzeugt, wobei der äußere Mantel ein Brechen bei schrägem Zielaufprall verhindert. Die Herstellung einer separaten Hülle und ein aufwendiges Befestigen einer derartigen Hülle an dem Penetratorkern, wie im Falle der vorstehend erwähnten DE 40 16 051 C2, kann entfallen.By means of the method according to the invention, a penetrator is produced with a core of high density and a tough outer sheath frictionally connected to the penetrator core, wherein the outer sheath prevents breakage on oblique target collision. The production of a separate shell and a complicated attachment of such a shell to the penetrator core, as in the case of the aforementioned DE 40 16 051 C2, can be omitted.
Bei einer vorteilhaften Ausführungsform der Erfindung hat sich als erste wolframhaltige Pulvermischung eine Mischung mit 95 Gew.-% Wolfram und einem Rest aus Nickel- und Kobaltpulver im Gewichtsverhältnis 9:1 erwiesen. Bei einer weiteren Ausführungsform der Erfindung ergab sich als zweite wolframhaltige Pulvermischung in vorteilhafter Weise eine Mischung von 87 Gew.-% Wolfram und einem Rest aus Nickel- und Kobaltpulver, ebenfalls im Gewichtsverhältnis 9:1.In an advantageous embodiment of the invention, the first tungsten-containing powder mixture has proven to be a mixture with 95% by weight of tungsten and a balance of nickel and cobalt powder in a weight ratio of 9: 1. In a further embodiment of the invention, a mixture of 87 wt .-% tungsten and a balance of nickel and cobalt powder, also in a weight ratio of 9: 1 resulted as the second tungsten-containing powder mixture in an advantageous manner.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Unteransprüchen.Further details and advantages of the invention will become apparent from the dependent claims.
Die Erfindung soll anhand eines Ausführungsbeispieles mit Zeichnung näher erläutert werden.The invention will be explained in more detail with reference to an embodiment with drawing.
Es zeigen:Show it:
Fig.1 einen Längsschnitt durch eine Form zur Herstellung eines Penetratorrohlings mit darin enthaltenen Pulvermischungen und1 shows a longitudinal section through a mold for producing a Penetratorrohlings containing therein powder mixtures and
Fig.2 einen Längsschnitt eines Teiles des nach dem erfindungsgemäßen Verfahren hergestellten Penetrators.2 shows a longitudinal section of a part of the penetrator produced by the process according to the invention.
In Fig.1 ist mit 1 eine an die Außenabmessungen des herzustellenden Presslings ange- passte Pressform aus Kunststoff bezeichnet, in der konzentrisch eine Doppeltrichterein- füllvorrichtung eingebracht ist. Das Innenrohr 3 und die Doppeltrichter 2 sind vorzugsweise aus Edelstahl und weisen eine Wandstärke von ca. 1 mm auf. Der zwischen der Pressform 1 und dem Innenrohr 3 befindliche ringförmige Raum besitzt einen Wandabstand von etwa 1/8 des Innendurchmessers. Beide konzentrischen Trichter sind im konischen Bereich mit Hilfe von Querstreben verbunden.In FIG. 1, 1 designates a plastic mold adapted to the outer dimensions of the compact to be produced, in which a double hopper filling device is concentrically inserted. The inner tube 3 and the double funnel 2 are preferably made of stainless steel and have a wall thickness of about 1 mm. The annular space located between the die 1 and the inner tube 3 has a wall distance of about 1/8 of the inner diameter. Both concentric funnels are connected in the conical area by means of transverse struts.
In das Innenrohr 3 wird eine erste wolframhaltige Pulvermischung 4 mit einem Wolframanteil von 95 Gew.-% und einem Rest aus Nickel- und Cobaltpulver im Gewichtsverhältnis 9:1 eingebracht. Anschließend wird in den ringförmigen Raum eine zweite wolframhaltige Pulvermischung 5 mit einem Wolframanteil von 87 Gew.-% und ebenfalls einem Rest aus Nickel- und Cobaltpulver im Gewichtsverhältnis 9:1 eingebracht.Into the inner tube 3, a first tungsten-containing powder mixture 4 is introduced with a tungsten content of 95 wt .-% and a balance of nickel and cobalt powder in a weight ratio of 9: 1. Subsequently, a second tungsten-containing powder mixture 5 having a tungsten content of 87% by weight and likewise a balance of nickel and cobalt powder in a weight ratio of 9: 1 is introduced into the annular space.
Nach dem Einbringen der Pulvermischungen 4 und 5 wird die Doppeltrichtereinfüllvorrich- tung aus der Pressmatrix 1 entfernt und anschließend die gesamte Pulvermischung nach einer z.B. durch Rütteln bewirkten Vorverdichtung hydrostatisch komprimiert. Anschließend wird dann der Pressung entsprechend den gewünschten Spezifikationen des ferti- gen Penetrators in an sich bekannter Weise gesintert, wärmebehandelt, kaltumgeformt, warm ausgelagert und dann durch ein spanendes Verfahren endbearbeitet, wie beispielsweise aus US 3,979,234 bekannt.After introduction of the powder mixtures 4 and 5, the double hopper filling device is removed from the pressmatrix 1 and then the entire powder mixture is hydrostatically compressed after pre-compaction caused, for example, by shaking. Subsequently, the pressing is then performed according to the desired specifications of the finished sintered in a conventional manner, heat-treated, cold-formed, hot outsourced and then finished by a machining process, as known for example from US 3,979,234.
Fig.2 zeigt den Längsschnitt eines Teiles des nach dem erfindungsgemäßen Verfahren hergestellten Penetrators 10. Dabei sind mit 6 der aufgrund des hohen Wolframanteiles relativ spröde Penetratorkem und mit 7 der aufgrund des geringeren Wolframanteiles wesentlich duktilere äußere Mantel mit Gewinde bezeichnet.2 shows the longitudinal section of a part of the penetrator 10 produced by the process according to the invention. In FIG. 6, the penetrator core, which is relatively brittle due to the high proportion of tungsten, and 7 the outer shell, which is significantly more ductile due to the lower tungsten content, are designated as threaded.
Zwischen dem Penetratorkem 6 und dem äußeren Mantel 7 ergibt sich ein Übergangsbereich 8 mit einer bevorzugten Dicke zwischen 25μm und 200μm, der eine gute Haftung zwischen dem Kern 6 und dem Mantel 7 gewährleistet. Der zähe Mantel 7 wird bevorzugt im spitzenseitigen Bereich beispielsweise durch spanabhebende Bearbeitung entfernt, so dass sie Spitze aus einem Kernwerkstoff besteht und beim Zielaufprall spröde bricht, wodurch immerscharfe Anbeißkanten entstehen, die ein gutes Anbeißverhalten gewährleisten. Between the Penetratorkem 6 and the outer jacket 7 results in a transition region 8 with a preferred thickness between 25μm and 200μm, which ensures good adhesion between the core 6 and the jacket 7. The tough shell 7 is preferably removed in the tip-side region, for example by machining, so that it is made of a core material tip and breaks brittle in the target impact, whereby ever sharp Anbeißkanten arise that ensure a good Anbeißverhalten.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Pressmatrix (kunststoff)1 press matrix (plastic)
2 Doppeltrichter (Edelstahl)2 double funnels (stainless steel)
3 Innenrohr (Edelstahl)3 inner tube (stainless steel)
4 Kernpulvermischung4 core powder mixture
5 Randpulvermischung5 edge powder mixture
6 spröder Penetratorkern6 brittle penetrator core
7 duktiler Penetratormantel (mit Gewinde)7 ductile penetrator jacket (with thread)
8 Übergangsbereich Kern -Mantel8 transition area core coat
10 Penetrator 10 penetrators

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Penetrators (10) aus Wolfram-Schwermetall mit hohem Wolframanteil und einem äußeren Mantel (7), der aus einem gegenüber dem Penetratorkern (6) duktileren Material besteht, wobei das Zwischenprodukt ein Pulvergemisch ist, dass gepresst, gesintert, kaltumgeformt etc. und dann endbearbeitet wird, mit den Merkmalen:A process for producing a penetrator (10) of tungsten heavy metal with a high tungsten content and an outer shell (7) consisting of a material more ductile than the penetrator core (6), the intermediate being a powder mixture pressed, sintered, cold formed etc. and then finished, with the features:
a) in eine an die Außenabmessungen des Penetrators (10) angepasste Pressmatrix (1) wird konzentrisch ein an die Abmessungen des Penetratorkerns (6) angepass- tes dünnwandiges Innenrohr (3) eingebracht und mit einer ersten wolframhaltigen Pulvermischung (4) mit einem Wolframanteil zwischen 90 Gew.-% und 97 Gew.-% gefüllt;a) in a to the outer dimensions of the penetrator (10) adapted press matrix (1) is concentrically adapted to the dimensions of the penetrator (6) adapted thin-walled inner tube (3) and with a first tungsten-containing powder mixture (4) with a tungsten between 90% by weight and 97% by weight filled;
b) der zwischen der Außenwand des Innenrohres (3) und der Innenwand der Pressmatrix (1) befindliche ringförmige Raum wird mit einer zweiten wolframhaltigen Pulvermischung (5) gefüllt, deren Wolframanteil zwischen 85 Gew.-% und 91 Gew.-% liegt;b) the annular space located between the outer wall of the inner tube (3) and the inner wall of the press matrix (1) is filled with a second tungsten-containing powder mixture (5) whose tungsten content is between 85% and 91% by weight;
c) anschließend wird die Doppeltrichtereinfülleinrichtung aus der Pressmatrix (1) entfernt und das gesamte Pulvergemisch weiterverarbeitet.c) then the Doppeltrichtereinfülleinrichtung is removed from the press matrix (1) and further processed the entire powder mixture.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die erste wolframhaltige Pulvermischung (4) 95 Gew.-% Wolfram enthält und der Rest der Pulvermischung aus Nickel- und Kobaltpulver besteht.2. The method according to claim 1, characterized in that the first tungsten-containing powder mixture (4) contains 95 wt .-% tungsten and the remainder of the powder mixture consists of nickel and cobalt powder.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zweite wolframhaltige Pulvermischung (5) 87 Gew.-% Wolfram enthält und der Rest der Pulvermischung aus Nickel- und Kobaltpulver besteht.3. The method according to claim 1 or 2, characterized in that the second tungsten-containing powder mixture (5) contains 87 wt .-% tungsten and the remainder of the powder mixture consists of nickel and cobalt powder.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass das Nickel- und Kobaltpulver in der ersten und/oder zweiten wolframhaltigen Pulvermischung (4, 5) ein Gewichtsverhältnis zwischen 2:1 und 10:1 , vorzugsweise 9:1 aufweisen. 4. The method according to claim 2 or 3, characterized in that the nickel and cobalt powder in the first and / or second tungsten-containing powder mixture (4, 5) have a weight ratio between 2: 1 and 10: 1, preferably 9: 1.
PCT/EP2006/009509 2005-10-18 2006-09-30 Method for producing a penetrator WO2007045342A1 (en)

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EP06792334A EP1940574B1 (en) 2005-10-18 2006-09-30 Method for producing a penetrator
PL06792334T PL1940574T3 (en) 2005-10-18 2006-09-30 Method for producing a penetrator
US12/083,671 US8580188B2 (en) 2005-10-18 2006-09-30 Method for producing a penetrator

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DE102007037702A1 (en) 2007-08-09 2009-02-12 Rheinmetall Waffe Munition Gmbh Method and apparatus for producing a tubular solid body from a high-melting tungsten-heavy metal alloy, in particular as a semi-finished product for the production of a penetrator for a balancing projectile with splinter effect
FR3039266B1 (en) * 2015-07-22 2017-09-01 Cime Bocuze PENETRATOR HAVING A CORE SURROUNDED BY A DUCTILE SHEATH AND METHOD FOR MANUFACTURING SUCH A PENETRATOR
JP6682601B2 (en) * 2018-10-31 2020-04-15 Ntn株式会社 Molding method of green compact and manufacturing method of sintered bearing
CN109795096A (en) * 2018-12-27 2019-05-24 中山伟强科技有限公司 A kind of heat-transfer device mouth-sealing method
CN114147233B (en) * 2022-02-10 2022-04-12 北京煜鼎增材制造研究院有限公司 Missile warhead shell and additive manufacturing method thereof
CN115625337A (en) * 2022-12-06 2023-01-20 成都虹波实业股份有限公司 Novel tungsten alloy composite material and preparation method thereof

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EP1940574B1 (en) 2012-06-06
US8580188B2 (en) 2013-11-12
PL1940574T3 (en) 2012-11-30
EP1940574A1 (en) 2008-07-09
US20090169411A1 (en) 2009-07-02
DE102005049748A1 (en) 2007-04-19

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